CompuGen 3250
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CompuGen 3250 product introduction
CompuGen 3250 is a family of 50 MHz, 32 bit ISA bus based digital pattern generator cards. Its key features
are:
•
50 MHz digital pattern generation
•
32 bit-wide word
•
Up to 8 Meg x 32 memory buffer
Characteristics of the CompuGen 3250:
•
50 MHz CLOCK RATE
The CompuGen 3250 uses high-speed digital memory components that operate at a maximum clock
speed of 50 MHz. In other words, a new sample is output every 20 nanoseconds.
An on-board crystal-controlled oscillator ensures timebase accuracy and long-term thermal stability.
•
OUTPUT
The CompuGen 3250 provides high current drive TTL/CMOS outputs using four (4) 74FCT162245
drivers in parallel. The outputs can drive a 0 to 5 Volt signal into a 50
Ω
load.
•
MEMORY DEPTH
CompuGen 3250 is available with memory depths from 256K to 8M samples. Each “sample” consists of
a 32 bit word.
•
MEMORY LOOPING
Memory looping allows the on-board memory to be optimized. For example, a 4096 point pattern can be
repeated 1000 times using only 4096 words of memory, instead of 4,096,000 words. Infinite looping is
also possible using CG3250.
•
TRIGGERING
The CompuGen 3250 supports both internal and external triggering.
For internal triggering, software generates the trigger signal through an on-board register on a single or
periodic basis.
The CompuGen 3250 also provides a TTL External Trigger Input. External triggering can be software
selected by setting the appropriate bits in an on-board register. Software can also control whether the
trigger occurs on the rising or falling edge of this external trigger signal.
The CompuGen 3250 also supports the retriggerable mode, where a pattern is produced every time a
trigger occurs. In this mode the trigger is automatically re-armed in hardware at the end of signal
generation.
•
EXTERNAL CLOCK
An External Clock option can be ordered from the factory where a special real-time clock frequency is
required or when the output must be coherent with the rest of the system.
A new 32 bit word is output on every rising edge of the clock.
The user is responsible for ensuring that the maximum External Clock frequency remains lower than or
equal to 50 MHz.
There is no limit on how low this clock frequency can go, i.e. External Clock can be started and stopped
at will.
The input level required for External Clock signal is 0 to 5 Volt CMOS/TTL.
•
MULTI-CARD SYSTEMS
A multi-card system, comprising one Master and up to 7 Slave cards, can be ordered if more than one
output channel is needed. All signals necessary for synchronization of multiple CompuGen 3250 cards
are passed from the Master to the Slave cards using a Master/Slave Timing Module.
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